Wyoming River Map showing major rivers in Wyoming, River start and end point, county boundaries.
River Map of Wyoming State
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Rivers and Waterways in Wyoming
Wyoming’s river systems are shaped by mountains, high plains, and basins, with water flowing in multiple directions across the state. Rivers in the west drain into the Columbia River system, while central and eastern rivers flow into the Missouri and Mississippi rivers. Some areas also contribute to the Colorado River system. Snowmelt from mountain ranges is the primary water source. Reservoirs and lakes are essential for irrigation, water storage, and supporting communities across Wyoming’s dry landscape.
Major Rivers in Wyoming
| River | Length (Approx.) | Region | Flows Into |
|---|---|---|---|
| Green River | 730 mi | West | Colorado River |
| Snake River | 1,078 mi | West | Columbia River |
| Yellowstone River | 692 mi | North | Missouri River |
| North Platte River | 716 mi | Central | Platte River |
| South Platte River | 439 mi | Southeast | Platte River |
| Bighorn River | 461 mi | North | Yellowstone River |
| Wind River | 185 mi | Central | Bighorn River |
| Powder River | 375 mi | Northeast | Yellowstone River |
| Little Snake River | 210 mi | Southwest | Yampa River |
| Shoshone River | 100 mi | Northwest | Bighorn River |
| Sweetwater River | 105 mi | Central | North Platte River |
| Encampment River | 70 mi | South | North Platte River |
| Hams Fork | 120 mi | West | Green River |
| Greybull River | 90 mi | North | Bighorn River |
| Nowood River | 95 mi | North | Bighorn River |
| Bear River | 491 mi | Southwest | Great Salt Lake |
| Salt River | 84 mi | West | Snake River |
| Laramie River | 280 mi | Southeast | North Platte River |
Major Lakes in Wyoming
| Lake | Type | Region |
|---|---|---|
| Yellowstone Lake | Natural lake | Northwest |
| Jackson Lake | Reservoir | Northwest |
| Flaming Gorge Reservoir | Reservoir | Southwest |
| Boysen Reservoir | Reservoir | Central |
| Buffalo Bill Reservoir | Reservoir | Northwest |
| Seminoe Reservoir | Reservoir | Central |
| Pathfinder Reservoir | Reservoir | Central |
| Alcova Reservoir | Reservoir | Central |
| Keyhole Reservoir | Reservoir | Northeast |
| Glendo Reservoir | Reservoir | Southeast |
Major River Basins in Wyoming
Wyoming’s river basins are divided among three major drainage systems: the Colorado River, the Columbia River, and the Missouri River. These basins are essential for water supply, agriculture, and ecosystem management across the state.
- Colorado River Basin
- Columbia River Basin
- Missouri River Basin
- Green River Basin
- Snake River Basin
- Yellowstone River Basin
- North Platte River Basin
- Bighorn River Basin
- Powder River Basin
Wyoming Rivers Facts
| State | Wyoming |
| Total Rivers & Streams | 100,000+ miles of streams |
| Major Rivers | Green, Snake, Yellowstone, Platte |
| Total Waterway Length | 105,000+ miles |
| Main Drainage | Colorado, Columbia & Missouri Systems |
| Longest River | Snake River |
| Shortest River | Salt River |
| Major River Basins | 9 Primary Basins |
| Primary Outlet | Pacific Ocean & Gulf of Mexico |
| Key Uses | Irrigation, water supply, recreation, ecosystems |
| Longest River Within State | Green River |
| Number of River Basins | 8–10 Basins |
| Major Reservoirs | Flaming Gorge, Boysen, Pathfinder Reservoir |
| Primary Water Source | Snowmelt and surface water |
River Map OF U.S. 50 States - Click on State name for its River Map
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